David W. Berning

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Potomac, MD, US

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Patents Grantslast 30 patents

Information Patent Grant
Output transformerless amplifier impedance matching apparatus
- Patent number 5,612,646
- Issue date Mar 18, 1997
- David W. Berning
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Audio amplifier
- Patent number 4,163,198
- Issue date Jul 31, 1979
- David W. Berning
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Audio amplifier
- Patent number 3,995,226
- Issue date Nov 30, 1976
- David W. Berning
- H03 - BASIC ELECTRONIC CIRCUITRY